Filter adaptor



FIG. 1 is a perspective view of my ornamental design of a filter adaptor;

FIG. 2 is a top plan view of the filter adaptor of FIG. 1;

FIG. 3 is a bottom plan view of the filter adaptor of FIG. 1;

FIG. 4 is a side elevation view of the filter adaptor of FIG. 1;

FIG. 5 is a side section view of the filter adaptor along line 5-5 of FIG. 1, showing the inside surface visible in FIG. 2; and,

FIG. 6 is a detail section view of the filter adaptor along line 6 of FIG. 5. 

CLAIM I claim the ornamental design for a filter adaptor, as shown and described. 